Improvement in millstones



W Baluma.

evjejr Sjphgeasdmf 72587 lili/l /H PATENTED DEC 24 i867- @auch tutes .gaten-t fibbia-1:'.

IMPROVEMENT 1M MlLLsrours 'alge' rlgshnle ruimt in iti time @um atmt mit nuttig putti tigt sulla.

To ALL WHoM rr MAY coNoEnN:

'Be it known that I, WILLAM BAHME, of New Media, iu the county of Columbia, and State of Pennsylvania., have invented anew and useful Device for Sinking the Besoins of Millstones; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing` which is made part'of this/specification. i l

After repeated dressings, that part of the face nearest the skirt is worn down until the bosom of the stone becomes prominent, and it is necessary to sink it, to perform which labor with dispatch and ease is the object of my invention, which consists in the use-offs. stone of proper circumference to suit the size of the run of stones, having its grinding-face convex or bevelled, and suitably roughened to cut the stone to -be acted on,

which, bybeing placed in the centre of the face ofthe stone, and motion imparted to it, quickly and accurately,

performs the work. In the drawingslFigure 1 is a plan view of a run of stones, showing o ne mode of applying my invention, the runnerk being turned up, as for dressing'.

Figure 2 is an elevationwitlrpartial vertical section on the line a; x, iig. 1. Figure 3 is a vertical section of a differeiit'mode ofapplying my invention, showing the runner turned up on the bed-stone, andmotion imparted to the'hosom-sinking stone from the ordinary spindle. A A represent, respectively, the bed-stone and'runner of a runof stones. B is-thc main driving-shaft, from suitable gearing or pulleys on thelower end of which the spindle C is operated, This shaft, at any suitable height, is provided with apulley, D., which I prefer .to construct with a ilange, tZ,-by.which, through the belt E, motion is imparted to the pulley F, constructed similarly to the pulley D, on the shaft Gr, the upper end of which is journalled in a suitable bearing directly over the centre of the runner, (when turned over,) and its lower end has its scat or step in the cock-eye in the cross-bar a, the driver being removed to allow its attachment. The shaft G, at a proper point, is made square, as shown at g, which part ts the opening in the driver h of the stone H, in collins, in the lower side of which the driver is secured in. the usual way. The lower side of stone H is convex or bevelled, and is provided with radial furrows, which act on and wear away that part of the stone which they come in contact with.l When the stone H is to be used on the bed-st`onc A, it is placed thereon, as shown in red lines,bein`g driven by .the ordinary spindle C, over which its drivcr't its in the customary manner. When the rynd may be readily removed the runner may be simply turned up on the bed-stone A, as shown in fig. 3,' and the rynd and driver being removed, the stone II is applied and motion imparted to it from the ordinary spindleC, through 'an upright shaft, I. This shaft is constructed with a square tubular opening, z', in its lower end, which tits the upper end of the spindle, and a square, t", at a proper distance above, to engage with the driver 72, and at its upper, end is secured in suitable bearings in the ceiling or rafters. When not in use, the shafting, with their appendages, may be removed and stowed awa-y in-any suitable place.

Having thus described my invention, what I claim as new, and desire/to secure by Letters Patent, is-- 1.' The stone Il, adapted and employed to sink or grind out the central portion of millstones, substantially as and for the purposes set forth.

2. The shaft Gr g and driving-apparatus D E F, in the described combination with the stone II, for the purpose specified.

3. The upright shaft l', constructed as described, in-combination with the spindle C and stone H, substantially as and for the purpose specified;

WILLIAM BAHME.

Witnesses:

PETER SWANK, JOHN Rame. 

